HELP..... jumped into my sons 2002 A-4, changed the radio station and it quit working.... All the lights are on and can switch stations but the volume control will not work or even able to changed stations with the ****. Will not play CD, and is now just showing eject of CD#2. Is there a mute button that I switched on? They boy is going to kill me, but I did just pay to have his timing belt replaced at 1300 bones.

 

What happens when the battery is unhooked triggering the anti theft for the stereo? Just wondering since it lights up like it is working, or can I do a reboot by shutting down the power but then how do I reset the anti theft???